cg_test, an Octave code which calls cg(), which implements a simple version of the conjugate gradient (CG) method for solving a system of linear equations of the form A*x=b, suitable for situations in which the matrix A is symmetric positive definite (SPD) (only real, positive eigenvalues).
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cg, an Octave code which implements a simple version of the conjugate gradient (CG) method for solving a system of linear equations of the form A*x=b, suitable for situations where the matrix A is positive definite (only real, positive eigenvalues) and symmetric.